Method for making bearing inserts



Patented June 5, 1951 METHOD FOR MAKING BEARING INSERTS Carl Scully, Detroit, Mich., assignor to 0. & S.

Bearing Company, Detroit, Mich., a corporation of Michigan Application May 25, 1941.9, Serial No. 95,350

1 Claim. 1

This invention relates to a method for making bearing inserts.

It is an object of the invention to form a bushing which is properly sized, starting with a series of short straight strips of metal and lubricant impregnated material bonded thereto. Briefly, the invention consists of a machine, including a forming die and a sizing die with a feeding slide which selects a piece of material from a storage magazine, feeds it into a forming die around a core which latter projects axially to force the work into and through a forming die, at the same time ejecting it completely from the unit.

Other objects and features of this invention will be evident from the following description and claims.

Drawings accompany this specification and the various views thereof may be briey described as:

Figure l, a perspective viewrshowing the apparatus with the forming core and ejector unit separated from the forming dieiand sizing die.

Figure 2, a sectional view through the storage magazine and forming die illustrating the relationship of the parts.

Figure 3, a sectional view of the finishing or sizing die.

Figure 4, a sectional view on line 4--4 of Figure 2.

In Figure l, on a suitable platform I0, I have shown a forming die I2 and a finishing die I4. The forming die has a main opening I6 and an entrance opening I8, the lower side of which is tangential to the outer wall of the opening I5. The details of this die will be described later. Aligned with the opening I8 is a guide 2t having a track 22 in which is located a feeder slide 24. `reciprocable by a hydraulic or pneumatic ram 26 operating on a piston-cylinder motor 25. Mounted on the guide 20 is a storage magazine 30 having an opening which is disposed directly over the feeder slide 24. The ram 26 has suiicient travel that the feeder slide 24 can be retracted just behind the magazine 3Q, where it will pick up a blank of material which consists of a laminated piece of metal 36 and fabric 38 welded together by a thermoplastic material as defined more in detail in oopending application Serial No. 69,366 filmed January 5, 1949, in the name of Axel W. Kogstrom.

Upon each retraction of feeder 24 a blank will be picked up and as the ram moves forward the blank will be projected through the tangential opening I8 into the circular opening I6 in die I2. The feeder 24 is adapted to project into the die as shown in Figure 2, up to the vertical diameter thereof. Projectable axially into the recess I5 is a core member 4i) (Figure l) which is so` held relative to die I2 that it positions itself eccentrically of the opening I6, as shown in Figure 2. The smallest degree of eccentricity is found on the vertical diameter at the bottom of the assembly, as shown in Figure 2, or approximately at this point. The circumferential dimension of the opening I6 is such that the entire length of the blank will be absorbed before the feed end 44 returns to the point of entry. However, due to the dimension at the point of entry at approximately 46, as shown in Figure 2, the proper curvature will be imparted to the blank even though the dimension between the walls increases from this point on. The feeder 24 enters the die recess sufficiently far to give this form to the entire blank.

Behind the core 4 is an enlarged portion 4B starting at a shoulder 50. After the first forming step, as above described and shown best in Figure 2, the core is projected through the die where the shoulder 5D will pick up the partially formed unit, as shown in Figure 2, and force it into an opening 54 in the sizing die I4. The parts are so disposed that when the portion 48 of the core enters the opening IB the core 4I! will be centrally located with respect to the opening 54 (see Figure 3). The opening 54 at the point adjacent die I2 is tapered at 56 to permit the necessary feeding action from the enlarged opening I6. As the extension 48 of core 40 passes through the two dies, the blank is properly dimensioned inside and out and ejected from the opening 54.

The forming steps may proceed in sequence. After the projection of the feeder 24 to the point shown in Figure 2 it is immediately retracted and the extension 48 is projected through the dies to complete the action. This apparatus may be set up with automatic controls to form these completed bushings continuously. It will be understood that suitable mechanical pilot means may be used to position the core 40 and the eXtension 48 in the die as above described. Likewise, suitable means in the nature of a mechanical ram or fluid motor may be used to project the core into the die.

What I claim is: 4

In a forming method of the type in which straight blanks are pushed endwise into a tangential opening at the sides of a cylindrical recess containing a mandrel, those steps required to form a complete cylindrical tube from a straight blank which comprise mounting the mandrel in a permarient position rigidly associated with the opening angl ,eccentrically positioned relative thereto, the spacing, due to the eccentricity, being least at theylopening, projecting blanks into the opening andv therecess to form them partially and oversize and projectingr said partially formed blanks endwise through a final forming die to Vbring the ends together to complete the cylindrical shaping.

CARL SCULLY. f

REFERENCES CITED The following references are of record in the ille of this patent:

5 UNITED STATES PATENTS Number Name Date .11,290,578 Klocke Jan. 7, 1919 1,360,243 Muller Nov. 23, 1920 10 l2,245,407 Lignian June 10, 1941 

